| 1 | #include <time.h> |
| 2 | #include <sys/time.h> |
| 3 | |
| 4 | #include "fio.h" |
| 5 | |
| 6 | static struct timespec genesis; |
| 7 | static unsigned long ns_granularity; |
| 8 | |
| 9 | void timespec_add_msec(struct timespec *ts, unsigned int msec) |
| 10 | { |
| 11 | uint64_t adj_nsec = 1000000ULL * msec; |
| 12 | |
| 13 | ts->tv_nsec += adj_nsec; |
| 14 | if (adj_nsec >= 1000000000) { |
| 15 | uint64_t adj_sec = adj_nsec / 1000000000; |
| 16 | |
| 17 | ts->tv_nsec -= adj_sec * 1000000000; |
| 18 | ts->tv_sec += adj_sec; |
| 19 | } |
| 20 | if (ts->tv_nsec >= 1000000000){ |
| 21 | ts->tv_nsec -= 1000000000; |
| 22 | ts->tv_sec++; |
| 23 | } |
| 24 | } |
| 25 | |
| 26 | /* |
| 27 | * busy looping version for the last few usec |
| 28 | */ |
| 29 | uint64_t usec_spin(unsigned int usec) |
| 30 | { |
| 31 | struct timespec start; |
| 32 | uint64_t t; |
| 33 | |
| 34 | fio_gettime(&start, NULL); |
| 35 | while ((t = utime_since_now(&start)) < usec) |
| 36 | nop; |
| 37 | |
| 38 | return t; |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * busy loop for a fixed amount of cycles |
| 43 | */ |
| 44 | void cycles_spin(unsigned int n) |
| 45 | { |
| 46 | unsigned long i; |
| 47 | |
| 48 | for (i=0; i < n; i++) |
| 49 | nop; |
| 50 | } |
| 51 | |
| 52 | uint64_t usec_sleep(struct thread_data *td, unsigned long usec) |
| 53 | { |
| 54 | struct timespec req; |
| 55 | struct timespec tv; |
| 56 | uint64_t t = 0; |
| 57 | |
| 58 | do { |
| 59 | unsigned long ts = usec; |
| 60 | |
| 61 | if (usec < ns_granularity) { |
| 62 | t += usec_spin(usec); |
| 63 | break; |
| 64 | } |
| 65 | |
| 66 | ts = usec - ns_granularity; |
| 67 | |
| 68 | if (ts >= 1000000) { |
| 69 | req.tv_sec = ts / 1000000; |
| 70 | ts -= 1000000 * req.tv_sec; |
| 71 | /* |
| 72 | * Limit sleep to ~1 second at most, otherwise we |
| 73 | * don't notice then someone signaled the job to |
| 74 | * exit manually. |
| 75 | */ |
| 76 | if (req.tv_sec > 1) |
| 77 | req.tv_sec = 1; |
| 78 | } else |
| 79 | req.tv_sec = 0; |
| 80 | |
| 81 | req.tv_nsec = ts * 1000; |
| 82 | fio_gettime(&tv, NULL); |
| 83 | |
| 84 | if (nanosleep(&req, NULL) < 0) |
| 85 | break; |
| 86 | |
| 87 | ts = utime_since_now(&tv); |
| 88 | t += ts; |
| 89 | if (ts >= usec) |
| 90 | break; |
| 91 | |
| 92 | usec -= ts; |
| 93 | } while (!td->terminate); |
| 94 | |
| 95 | return t; |
| 96 | } |
| 97 | |
| 98 | uint64_t time_since_genesis(void) |
| 99 | { |
| 100 | return time_since_now(&genesis); |
| 101 | } |
| 102 | |
| 103 | uint64_t mtime_since_genesis(void) |
| 104 | { |
| 105 | return mtime_since_now(&genesis); |
| 106 | } |
| 107 | |
| 108 | uint64_t utime_since_genesis(void) |
| 109 | { |
| 110 | return utime_since_now(&genesis); |
| 111 | } |
| 112 | |
| 113 | bool in_ramp_time(struct thread_data *td) |
| 114 | { |
| 115 | return td->o.ramp_time && !td->ramp_time_over; |
| 116 | } |
| 117 | |
| 118 | static bool parent_update_ramp(struct thread_data *td) |
| 119 | { |
| 120 | struct thread_data *parent = td->parent; |
| 121 | |
| 122 | if (!parent || parent->ramp_time_over) |
| 123 | return false; |
| 124 | |
| 125 | reset_all_stats(parent); |
| 126 | parent->ramp_time_over = true; |
| 127 | td_set_runstate(parent, TD_RAMP); |
| 128 | return true; |
| 129 | } |
| 130 | |
| 131 | bool ramp_time_over(struct thread_data *td) |
| 132 | { |
| 133 | if (!td->o.ramp_time || td->ramp_time_over) |
| 134 | return true; |
| 135 | |
| 136 | if (utime_since_now(&td->epoch) >= td->o.ramp_time) { |
| 137 | td->ramp_time_over = true; |
| 138 | reset_all_stats(td); |
| 139 | reset_io_stats(td); |
| 140 | td_set_runstate(td, TD_RAMP); |
| 141 | |
| 142 | /* |
| 143 | * If we have a parent, the parent isn't doing IO. Hence |
| 144 | * the parent never enters do_io(), which will switch us |
| 145 | * from RAMP -> RUNNING. Do this manually here. |
| 146 | */ |
| 147 | if (parent_update_ramp(td)) |
| 148 | td_set_runstate(td, TD_RUNNING); |
| 149 | |
| 150 | return true; |
| 151 | } |
| 152 | |
| 153 | return false; |
| 154 | } |
| 155 | |
| 156 | void fio_time_init(void) |
| 157 | { |
| 158 | int i; |
| 159 | |
| 160 | fio_clock_init(); |
| 161 | |
| 162 | /* |
| 163 | * Check the granularity of the nanosleep function |
| 164 | */ |
| 165 | for (i = 0; i < 10; i++) { |
| 166 | struct timespec tv, ts; |
| 167 | unsigned long elapsed; |
| 168 | |
| 169 | fio_gettime(&tv, NULL); |
| 170 | ts.tv_sec = 0; |
| 171 | ts.tv_nsec = 1000; |
| 172 | |
| 173 | nanosleep(&ts, NULL); |
| 174 | elapsed = utime_since_now(&tv); |
| 175 | |
| 176 | if (elapsed > ns_granularity) |
| 177 | ns_granularity = elapsed; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | void set_genesis_time(void) |
| 182 | { |
| 183 | fio_gettime(&genesis, NULL); |
| 184 | } |
| 185 | |
| 186 | void set_epoch_time(struct thread_data *td, clockid_t log_alternate_epoch_clock_id, clockid_t job_start_clock_id) |
| 187 | { |
| 188 | struct timespec ts; |
| 189 | fio_gettime(&td->epoch, NULL); |
| 190 | clock_gettime(log_alternate_epoch_clock_id, &ts); |
| 191 | td->alternate_epoch = (unsigned long long)(ts.tv_sec) * 1000 + |
| 192 | (unsigned long long)(ts.tv_nsec) / 1000000; |
| 193 | if (job_start_clock_id == log_alternate_epoch_clock_id) |
| 194 | { |
| 195 | td->job_start = td->alternate_epoch; |
| 196 | } |
| 197 | else |
| 198 | { |
| 199 | clock_gettime(job_start_clock_id, &ts); |
| 200 | td->job_start = (unsigned long long)(ts.tv_sec) * 1000 + |
| 201 | (unsigned long long)(ts.tv_nsec) / 1000000; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | void fill_start_time(struct timespec *t) |
| 206 | { |
| 207 | memcpy(t, &genesis, sizeof(genesis)); |
| 208 | } |